JP2009159746A5 - - Google Patents

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Publication number
JP2009159746A5
JP2009159746A5 JP2007335808A JP2007335808A JP2009159746A5 JP 2009159746 A5 JP2009159746 A5 JP 2009159746A5 JP 2007335808 A JP2007335808 A JP 2007335808A JP 2007335808 A JP2007335808 A JP 2007335808A JP 2009159746 A5 JP2009159746 A5 JP 2009159746A5
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JP
Japan
Prior art keywords
power supply
terminal
voltage
load
conductivity type
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JP2007335808A
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Japanese (ja)
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JP5112846B2 (en
JP2009159746A (en
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Priority claimed from JP2007335808A external-priority patent/JP5112846B2/en
Priority to JP2007335808A priority Critical patent/JP5112846B2/en
Priority to TW097148772A priority patent/TWI431898B/en
Priority to KR1020080131022A priority patent/KR101188148B1/en
Priority to US12/342,232 priority patent/US7800433B2/en
Priority to CN200810185046XA priority patent/CN101471579B/en
Publication of JP2009159746A publication Critical patent/JP2009159746A/en
Publication of JP2009159746A5 publication Critical patent/JP2009159746A5/ja
Publication of JP5112846B2 publication Critical patent/JP5112846B2/en
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Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Claims (3)

第一電源を接続するための端子に設けられ、前記第一電源が電源切替回路に接続されたことを検知すると、検知信号を出力する第一電源検知回路と、
第一導電型基板に形成され、ドレインが前記第一電源を接続するための端子に設けられ、ソースが前記負荷を接続するための端子に設けられ、前記検出信号が出力されるとオンして前記第一電源の電源電圧を前記負荷に供給し、前記検出信号が出力されないとオフする第一の第二導電型ＭＯＳと、
前記第一導電型基板に形成され、ドレインが第二電源を接続するための端子に設けられ、ソースが前記負荷を接続するための端子に設けられ、前記検出信号が出力されるとオフし、前記検出信号が出力されないとオンして前記第二電源の電源電圧を前記負荷に供給する第二の第二導電型ＭＯＳとを有する電源切替回路において、
アノードが前記第一電源を接続するための端子に設けられ、カソードが昇圧回路の入力端子に設けられる第一整流素子と、
アノードが前記第二電源を接続するための端子に設けられ、カソードが前記昇圧回路の入力端子に設けられる第二整流素子と、
前記第一電源の電源電圧と前記第二電源の電源電圧との中の高い電源電圧に基づいて昇圧動作を行い、昇圧電圧を出力する前記昇圧回路と、
前記昇圧電圧に基づき、前記第一の第二導電型ＭＯＳを制御する第一レベルシフタと、
前記昇圧電圧に基づき、前記第二の第二導電型ＭＯＳを制御する第二レベルシフタと、
を備えることを特徴とする電源切替回路。 A first power supply detection circuit that outputs a detection signal when it is provided at a terminal for connecting a first power supply and detects that the first power supply is connected to a power supply switching circuit;
Formed on the first conductivity type substrate, the drain is provided at a terminal for connecting the first power supply, the source is provided at a terminal for connecting the load, and is turned on when the detection signal is output Supplying a power supply voltage of the first power supply to the load and turning off when the detection signal is not output;
Formed on the first conductivity type substrate, a drain is provided at a terminal for connecting a second power source, a source is provided at a terminal for connecting the load, and is turned off when the detection signal is output; In a power supply switching circuit having a second second conductivity type MOS that is turned on when the detection signal is not output and supplies a power supply voltage of the second power supply to the load ,
A first rectifying element provided with an anode at a terminal for connecting the first power supply and a cathode provided at an input terminal of the booster circuit;
A second rectifying element having an anode provided at a terminal for connecting the second power supply and a cathode provided at an input terminal of the booster circuit;
The boosting circuit that performs a boosting operation based on a high power supply voltage among the power supply voltage of the first power supply and the power supply voltage of the second power supply, and outputs the boosted voltage;
A first level shifter for controlling the first second conductivity type MOS based on the boost voltage;
A second level shifter for controlling the second second conductivity type MOS based on the boost voltage;
A power supply switching circuit comprising: 前記第二電源の電源電圧と前記負荷に供給される電源電圧とを比較するコンパレータ、A comparator for comparing the power supply voltage of the second power supply and the power supply voltage supplied to the load;
をさらに備えることを特徴とする請求項１記載の電源切替回路。The power supply switching circuit according to claim 1, further comprising: 前記第一電源を接続するための端子に設けられ、前記第一電源を接続するための端子をプルダウンするためのプルダウン回路、A pull-down circuit for pulling down a terminal for connecting the first power source, provided at a terminal for connecting the first power source;
をさらに備えることを特徴とする請求項１記載の電源切替回路。The power supply switching circuit according to claim 1, further comprising:
JP2007335808A 2007-12-27 2007-12-27 Power switching circuit Expired - Fee Related JP5112846B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2007335808A JP5112846B2 (en) 2007-12-27 2007-12-27 Power switching circuit
TW097148772A TWI431898B (en) 2007-12-27 2008-12-15 Power switching circuit
KR1020080131022A KR101188148B1 (en) 2007-12-27 2008-12-22 Power supply switching circuit
US12/342,232 US7800433B2 (en) 2007-12-27 2008-12-23 Power supply switching circuit
CN200810185046XA CN101471579B (en) 2007-12-27 2008-12-26 Power supply switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007335808A JP5112846B2 (en) 2007-12-27 2007-12-27 Power switching circuit

Publications (3)

Publication Number Publication Date
JP2009159746A JP2009159746A (en) 2009-07-16
JP2009159746A5 true JP2009159746A5 (en) 2010-11-25
JP5112846B2 JP5112846B2 (en) 2013-01-09

Family

ID=40797462

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007335808A Expired - Fee Related JP5112846B2 (en) 2007-12-27 2007-12-27 Power switching circuit

Country Status (5)

Country Link
US (1) US7800433B2 (en)
JP (1) JP5112846B2 (en)
KR (1) KR101188148B1 (en)
CN (1) CN101471579B (en)
TW (1) TWI431898B (en)

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